If you want to adjust the idle you will want to turn the idle screw not the mixture screw. The idlke screw is the big "screw" with a slotin it on the left side of the carb in front of the choke lever.
The mixture screw is on the bottom of the carb in front of the bowl. It is very difficult to get to to turn.
Lets see if this link works.... http://www.servicehonda.com/hard%20p...carburetor.htm
#11 will be the Idle screw
#6 will be the mixture screw.
Joe
ATVRiders Janitorial Technician
!!!!!DON'T FEED THE TROLLS!!!!!!